<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2007-2422</journal-id>
<journal-title><![CDATA[Tecnología y ciencias del agua]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnol. cienc. agua]]></abbrev-journal-title>
<issn>2007-2422</issn>
<publisher>
<publisher-name><![CDATA[Instituto Mexicano de Tecnología del Agua, Coordinación de Comunicación, Participación e Información]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-24222017000200141</article-id>
<article-id pub-id-type="doi">10.24850/j-tyca-2017-02-13</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Comparison on nitrosation and anaerobic ammonium oxidation between activated sludge and biofilm from an autotrophic nitrogen removal SBBR]]></article-title>
<article-title xml:lang="es"><![CDATA[Comparación de la nitrosación y la oxidación anaerobia de amonio entre lodo activado y biopelícula de un reactor biológico secuencial por lotes para la remoción autotrófica de nitrógeno]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Qin]]></surname>
<given-names><![CDATA[Yu]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guo]]></surname>
<given-names><![CDATA[Jinsong]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fang]]></surname>
<given-names><![CDATA[Fang]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Chongqing Jiaotong University  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Chongqing University  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>China</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<volume>8</volume>
<numero>2</numero>
<fpage>141</fpage>
<lpage>149</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-24222017000200141&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-24222017000200141&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-24222017000200141&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Activated sludge and biofilm from a Sequencing Biofilm Batch Reactor (SBBR) were studied to analyze their different roles in autotrophic nitrogen removal process. Results showed that under aerobic conditions, the ammonia oxidation rate of activated sludge was 100% and the maximum rate was 0.23 mgN mgVSS&#8722;1 d&#8722;1 during a 48 h test cycle. Under the same conditions, the ammonia oxidation rate of the biofilm was 72% and the maximum rate was 0.08 mgN mgVSS&#8722;1 d&#8722;1. The population of AOB (ammonium oxidizing bacteria) in activated sludge was 1.88×1011 cells/g, 10 times that in biofilm. The TN (total nitrogen) removal rate of activated sludge and biofilm under anaerobic conditions were 37% and 83%, respectively. The rate of anaerobic ammonium oxidation by activated sludge was 0.09 mgN mgVSS&#8722;1 d&#8722;1 and that of biofilm was 0.22 mgN mgVSS&#8722;1 d&#8722;1. ANAMMOX (anaerobic ammonium oxidizing bacteria) were the dominant bacteria in terms of cell number in this system, with 2.66×1012 cells/g in biofilm&#8212;2.6 times more than in activated sludge. TN was removed mainly by anaerobic ammonium oxidation.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se estudió el lodo activado y la biopelícula de un reactor biológico secuencial por lotes (SBBR) para analizar sus diferentes papeles en el proceso de remoción autotrófica de nitrógeno. Los resultados muestran que bajo condiciones aerobias, la velocidad de oxidación del amoníaco del lodo activado fue del 100% y la velocidad máxima fue de 0.23 mgN mgVSS&#8722;1 d&#8722;1 durante un ciclo de pruebas de 48 horas. Bajo las mismas condiciones, la velocidad de oxidación del amoníaco de la biopelícula fue de 72% y la velocidad máxima fue de 0.08 mgN mgVSS&#8722;1 d&#8722;1. La población de BOA (bacterias oxidantes del amonio) en el lodo activado fue de 1.88×1011 células/g, diez veces más que en la biopelícula. La tasa de remoción del NT (nitrógeno total) del lodo activado y de la biopelícula bajo condiciones anaerobias fue del 37 y 83%, respectivamente. La velocidad de oxidación anaerobia del amonio por el lodo activado fue de 0.09 mgN mgVSS&#8722;1 d&#8722;1 y la de la biopelícula fue de 0.22 mgN mgVSS&#8722;1 d&#8722;1. Las bacterias anaerobias oxidantes de amonio (ANAMMOX) fueron las bacterias dominantes en términos del número de células en este sistema, con 2.66×1012 células/g en la biopelícula &#8212; 2.6 veces más que en el lodo activado. El NT fue removido principalmente mediante la oxidación anaerobia del amonio.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Autotrophic nitrogen removal]]></kwd>
<kwd lng="en"><![CDATA[biofilm]]></kwd>
<kwd lng="en"><![CDATA[activated sludge]]></kwd>
<kwd lng="en"><![CDATA[AOB]]></kwd>
<kwd lng="en"><![CDATA[ANAMMOX]]></kwd>
<kwd lng="es"><![CDATA[remoción autotrófica de nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[biopelícula]]></kwd>
<kwd lng="es"><![CDATA[lodo activado]]></kwd>
<kwd lng="es"><![CDATA[BOA]]></kwd>
<kwd lng="es"><![CDATA[ANAMMOX]]></kwd>
</kwd-group>
</article-meta>
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